Dust-catching apparatus for middlings-purifiers



2 Sheets-Sheet 1.

(No Model.)

J.- MGDANIBL. DUSTUATGHING APPARATUS FOR'MIDDLINGS PURIPIBRS.

"Patentd June 2 0 -1 882'.

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Jane@ @/lcml.

N, PETERS. Pholnulhogrnpher, washlngmn, uc,

2 Sheets-Sheet 2 (No Model.)

J. MGDANIEL. DUST GATGHING APPARATUS P08 MI'DDLINGS 888181888 Patnted June 20, l18812.

Viiv/65363.

Invader James @/lcaizzlf Jay @5- J` 9 l N. PErEHs, Phum-Lmagnpher, wningxon, D. C.

UNITED STATES PATENT OFFICE.

JAMES MCDANIEL, OF MINNEAPOLIS, MINNESOTA.

DUST-CATCHING APPARATUS FORIVIIDDLINGS-PURIFIERS.

SPECIFICATION forming part of Letters Patent No. 259,888, dated June `20, 1882, Application filed April 3, 1882. (No model.)

To all whom it may concern Beit known that I, JAMES MGDANIEL', a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented new and usef'ul Improvements in Dust-Catching Apparatus for Middlings-Puriliers, of which the following is a specitication.

`My invention relates to an improved dustcatching apparatus -for middlings'- purifiers, bolting-chests, and similar machines, the object being to prevent accumulations of dust within the machine or mill, thereby avoiding liability ot' explosions and other inconveniences; aud the invention consists in a dustcatching apparatus comprising a series of vertically-movable frames or diaphragms,to which is attached a continuous dust-cloth that is connected with the sides and ends of the machine, and so arranged that while closely attached to said frames they may be jarred or moved independently of each other for the purpose of detachin g the dust deposited upon the cloth, said dust being caught upon a travelingr apron, from which it is automatically scraped into a trough attached thereto, and thence discharged at intervals into a pocket leading to the outer side of the machine.

The invention also consists in certain peculiarities in the construction and arrangement of parts, as hereinafter more fully set forth.

1n the accompanying drawings,which illus-` trate-my'invention, Figure l is a longitudinal section, showing the application of my invention to an ordinary sieve-purier, my improved dust-catching apparatus being arranged between the fan and shaker. Fig. 2 is a transverse section ot' the same. Fig. 3 is an enlarged longitudinal section of the dust-catching apparatus, showing, by means of dotted lines, where the edges of the dustcloth come in contact with the sides of the machine. Fig. 4 is a sectional top view, showing the manner of fastening the dust-cloth to the sides of the machine, and also the cleats for holding in position the diaphragms to which said dust-cloth is attached. Fig. 5 is an enlarged transverse section. ot' the dust-catchin g apparatus and means for operating the same.

, Like letters are used to designate the samev parts throughout the several views.

The dust-catching apparatus illustrated in these-drawings consists ot' a series of vertically-movable diaphragme or frames, D, that are preferably placed within the machine in a Vertical position above the sieve or shakerframe S, and between it andthe fan T an lendless dust-cloth, L, that is connected with the opposite ends and sides of the machine, being attached to the said frame inv the manner here-y inafter described, and an apron, H, to which is attached a trough, E, and a spring-knocker,

erated in connection with anypnrilier in which f the middlings are cleaned during the process of milling 'by means of or with the assistance of an air current or currents.

The dia'phragms or frames D are arranged transversely at suitable intervals, and rest in a vertical position upon the beveled surfaces ot' stationary bars O, the lower ends ofthe frames being provided centrally or at suitable points with knee-pieces K, that are bolted to said frames. By means of these knee-pieces the frames D are raised or moved vertically,

as will be hereinafter described.

Above the frames D is a longitudinal bar, B, to which are attachedthe counter-springs F, that force the frames back upon the bars O when said frames have been raised by the mechanism employed for jarring or moving them. f

The endless dust-cloth L, which is attached to the frames D, may be com posed of any material best adapted to give free vent to the air and at the same time prevent the passage of dust to the fan. This cloth is connected with the ends and sides ot' the machine, and is so attached to the frames D as to close the spaces between the same at the top and bottom alternately, and allow a free upward movement of too e caisses that the cloth L is arranged to run loosely from the head of the machine to and under the iirst or nearest frame D, being cleated to the lower edge ot' the frame, thence drawn tightly along the frame, and covering the same, to its top, where it is again cleated. It is then passed loosely to the top ofthe next or second frame, cleated, and drawn tightly to its bottom, thence under said second frame and again cleated and passed loosely to the lower end of the next or third frame, ami so on, being thus arranged to cover said frames and alternately close the spaces between the same at top and bottom. The cloth is also drawn tightly along each frame, from side to side, and is secured to the upright pieces of the frame, as shown in Fig. 4. Having been attached to each frame in the manner described, the cloth, after being passed underthelast frame,isrunloosely to the ends of the machine-frame and turned under and cleated thereto, as shown at a in Fig. l. It will be seen that by this manner ot' arranging the endless dust-cloth the frames to which it is attached may be moved vertically and independently ot' each other, as may be rcquired. This results from the cloth being left slack on all sides and between the frames.

Beneath the bars 0 is an apron, H, that may be made in one or more sections, as desired. This apron is driven by the endless chains C, that are carried by the star-pulleys VJ, which are mounted upon shafts provided with a d riving-pulley, A, as shown in Fig. 2.

To the rear end of the apron H is attached a dust receptacle or trough, E, and to the under side of the apron is attached a springknocker, P, having' a spring,P/,that is adapted to come in contact with the under sides ot' the inclined planes N, so as to depress the knocker P and cause the same, on the recoil ot' the spring after passing beneath an inclined plane, to be brought forcibly against a cushion-pin, X, which plays in an opening formed in the apron. This cushion-pin is thus caused to strike against the under side or foot of one of the knee-pieces K, thereby raising the frame D, to which it is attached, the frame being immediately forced downward by the tension of its counter-spring F, so as to come in forcible contact with its supportingbar O throughout its length. It will be seen that the frame thus receives a jar that causes the dust collected on the attached cloth L to fall upon the apron, whence it is scraped by the bars O into the trough E, that is carried at the rear end of said apron. The inclined plan es N are formed upon or attached to a bar, M, which is supported or journaled on the shafts of the starwheels W in any suitable manner, and said inclined planes are arranged at proper distances beneath the bars O to insure a proper action of the spring-knocker P upon the cushion-pin X, and thereby actuate the frames D in succession.

The operation of the apparatus is as follows: The aircurrent produced by the fan carries the dust andlight particles of bran upward, where they are arrested by the cloth L, attached to the vertical diaphragms or frames D, while the air is permitted to pass through to the mill-room, thus obviating the necessity ot employing dust-rooms and bloW-spouts. rEhe apron H is caused to move in the direction shown by the arrow in Fig. l by lneans of the wheels or pulleys lV and their attached chains. It will be seen that as the apron is carried around by the chains it is caused to pass to the head ofthe machine and through the cleats G, which are provided on each side for the purpose ot holding it in proper position beneath the supports ot' the diaphragme to which the dust-cloth is attached. When the apron is thus caused to cover the spaces between the head ot the machine and the irst two diaphragms the ar-currentis shut oifroni said spaces and the spring-knocker P has passed under the first inclined plane and strikes against thecushion-pin X, which in turn strikes the foot of the knee-piece and jars the-first one of the frames D, at the same time throwingit up against its counter-spring F, which immediately forces it back on the stationary bar O, where it rests. The apron moves on and covers the ends of three adjoining frames, when the second frame is likewise jarred. The aircurrent being now shut ott' at the under side ot' the dust-cloth from the first to the third frames, it will be seen that as the middle one of these framesrnoves upward theair-space willbe greater than when the frame was down, and as the return movementot' thei'ramcis quick and sudden from the blow the said frame has received there will bea vibration of the air back through the cloth in the opposite direction from the course oftheair-current when the air was being drawn through the cloth, thereby facilitating the action ofthe knocker in clearing the dustcloth. The dust thus loosened and detached from the cloth falls on the traveling apron, and as said apron moves along, in the manner be- .fore described, the stationary bars O,with which it is brought in contact, will scrape the dust into the trough or receptacle E. After all the frames have thus been acted upon and the attached cloth freed from dust the apron, in turning with the chain at the tail end of the machine, causes the trough to empty its contents into a pocket, It, whence the discharged dust passes to the outside of the machine, the operation being repeated as often as may be neccssary.

It will be seen that the manner of attaching the continuous dust-cloth to the vertical frames or diaphragms is such that while said cloth is drawn tightly over each frameit is left slack between them, so that each frame may be moved orjarred separately and independently of the others. The arrangement ot' the stationary bars upon which the vertical frames are supported is such that they not only serve as supports for said frames, but also act ediciently in scraping the accumulated dust from the traveling apron into its attached trough, be; sides forming, in connection with the apron, a

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vpositive shut-oft` against the passa-ge of aircurrents.' By providing a cushion-pin that is arranged to work through anopening in the apron the knocker and its actuating mechanism may be placed on the under side of the apron in a convenient position, where they are freev to operate without interference with other parts.v It will also be seen that the employmentof counter-springs arranged to act upon the upper' ends of the frames, so as -toforce them down against the drawing actionl of the fan and upwardimpnlse ot' the knocker, enables said frames to be constructed of light material without impairing their efficiency Vand with the advantage of lessenin g their cost.

What I claim is 1. In a dust-catching apparatus for -lnid- .dlings-puriliers, the combination, with vertical frames or diaphragms and a continuous dustcloth attached closely 'to said frames, with slack portions of cloth intervening, said cloth being so arranged as to close the spaces between the frames alternately at top and bottom, of mechanism for jarring the frames separately, whereby they may be cleaned independent of each other, substantially as described.

2. In a dust-catching apparatus for middlings-purifers, the combination, with the pu-A ritier-frame and vertical diaphragms arranged therein, of a continuous dust-cloth secured to the sides and ends of the purifier-frame and attached closely to the diaphragms, so asto close the spaces between saidV dlaphragms,

with slack portions of the cloth arranged alternately at the top and bottom of the spaces, whereby each frame or diaphragm is adapted to be moved or jarred independent of the others, substantially as described.

3. In a dust-catching apparatus for middlings-puriiers, the combination, with vertical moving frames having a continuous dust-l cloth attached thereto, and a traveling apron arranged horizontally -beneath said frames, of stationary horizontal bars placcd'between the Aapron and frames, and adapted to serve as supports for the vertical frames and provide a shut-off against the apron, whereby the passage of air-currents is prevented and the apron cleaned or scraped as it passes beneath said bars, substantially as described.

4. In a dust-catching apparatus for .middlings-puriliers, the combination,with vertical frames supporting a dust-cloth, of a traveling apron having a cushion-pin adapted towork in an opening formed therein, and .provided on its under side witha spring-knocker and mechanism for causing said knocker to strike against the 'cushion-pin at intervals, thereby jarring the vertical frames separately, substantially as described. l

5. In a dust-catching apparatus for middlings-puritiers, the combination, with the cloth-supporting frames, a continuous dust-- cloth secured to the sides'and ends of the purier, a'traveling apron arranged beneath the cloth-supporting frames, and provided with a dust-receiving trough, and mechanism for jar-A ringpthe frames separately and at intervals, of an endless carrying chain or chains, star-pulleys, and mechanism for actuating said pulleys, whereby the apron and its attachments are caused to shut off the air-currents, jar the dust-cloth and its supporting-frames, and conv vey the detached dust from the machine, substantially as described.

6. In a dustcatching apparatus for middlings-puritiers, the combination, with a traveling apron, of a trough attached-thereto, and a series of bars arranged above the apron and adapted to scrape the dust therefrom and into the attached trough, substantially as described. v

7. In a dust-catching apparatus for middlings-puriliers, the combination, with a traveling apron having a cushion-pin therein and a spring-knocker, ot' a longitudinal bar arranged beneath said apr'on, andprovided with a series of inclined planes adapted to engage the spring-knocker and depressthe same, thereby causing it to recoil against the cushion-pin arranged in the apron, whereby said pin is brought in forcible contact with one of the clot-hsupporting frames, substantially as described. l

8. In a dust-catching apparatus -for middlings-puritiers, the combination, with vertical frames or diaphragms provided with continuous dust-cloth, of a longitudinal bar arranged above said frames, and provided with counterspringsadapted to bear upon the upper ends ofthe frames and hold them down against the action of the fan and jarring mechanism, substantially as described.

9.7111 a dust-catching apparatus for middlings-purih'ers, the combination, with a fan and a sieve or shaker frame, of a series of vertical frames arranged between saidfan and sieve, and provided with a' continuous dust cloth arranged to close the spaces between said vertical frames alternately at top and bottom, substantially as described. f

10.' In a dust-catching apparatus for iniddlings-puritiers, the combination ot`-v vertical frames provided with a continuous dust-cloth and metallic knee-pieces with horizontal stationary vbars adapted to support said frames, a traveling apron, endless chains, a cushionpin in said apron, a spring-knocker, a trough, inclined planes placed beneath the apron and adapted to engage with and actuate the knocker, thereby jarrin g the frames and raising them vertically, and counter-springs'attached .to a bar above the framesand adapted to force `them down, substantially as described.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribin g witnesses.

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